scholarly journals Peculiarities of electroencephalogram of left-handed individuals in imagination and realiza-tion of feet movements

2018 ◽  
Vol 26 (3) ◽  
pp. 360-368
Author(s):  
Olga A. Vedyasova ◽  
Kseniya A. Morenova
Keyword(s):  
Alpha Rhythm ◽  
Right Hemisphere ◽  
Type I ◽  
Mu Rhythm ◽  
Type Iii ◽  
Left Handed ◽  
Hemisphere Dominance ◽  
Neurophysiological Mechanisms ◽  
The Right ◽  
Motor Acts

Background. Relevance of the study arises from a lack of knowledge about peculiarities of programming and realization of movements in individuals with different profiles of motor dominance. This knowledge is important for understanding the neurophysiological mechanisms of motor functions and for creating neurocomputer interfaces. Aim. The analysis of electroencephalogram (EEG) patterns in lefties during imaginary and real motor acts by right and left legs. Materials and Methods. The left-handed students were examined. They were divided into two groups on the basis of coefficients of motor asymmetry – with low (n=14) and high (n=7) degree of right-hemisphere dominance (LDRD and HDRD). EEG was recorded on neurovisor «NVX 36 digital DC EEG» in standard leads at rest and in successive imagination and fulfilment of movements by the right and left legs. Types of EEG were determined and the amplitude of the sensorimotor alpha-rhythm (mu-rhythm) was evaluated on the basis of analysis of spectral patterns of EEG. Results. It was shown that the majority of left-handed individuals with LDRD had type I EEG, and the minority had type III, whereas all left-handed individuals with HDRD had type I EEG. In imagination and realization of leg movements in the first group the quantity of individuals with EEG of type III increased, while in the second group the type of EEG did not change. Motor tasks were associated with depression of alpha-rhythm in central and frontal areas, but with different extent of evidence in lefties with LDRD and HDRD. More pronounced desynchronization of the central mu-rhythm was observed in left-handed individuals with HDRD, while the amplitude of the frontal alpha-rhythm, on the contrary, was more decreased in left-handed individuals with LDRD. Conclusions. The obtained data show dependence of EEG pattern in left-handed people during imagination and realization of motor acts by the leading and non-leading leg on the degree of the right hemisphere dominance that may find clinical application.

scholarly journals Peculiarities of electroencephalogram of left-handed individuals in imagination and realiza-tion of feet movements

2018 ◽  
Vol 26 (3) ◽  
pp. 360-368
Author(s):  
Olga A. Vedyasova ◽  
Kseniya A. Morenova
Keyword(s):  
Alpha Rhythm ◽  
Right Hemisphere ◽  
Type I ◽  
Mu Rhythm ◽  
Type Iii ◽  
Left Handed ◽  
Hemisphere Dominance ◽  
Neurophysiological Mechanisms ◽  
The Right ◽  
Motor Acts

Background. Relevance of the study arises from a lack of knowledge about peculiarities of programming and realization of movements in individuals with different profiles of motor dominance. This knowledge is important for understanding the neurophysiological mechanisms of motor functions and for creating neurocomputer interfaces. Aim. The analysis of electroencephalogram (EEG) patterns in lefties during imaginary and real motor acts by right and left legs. Materials and Methods. The left-handed students were examined. They were divided into two groups on the basis of coefficients of motor asymmetry – with low (n=14) and high (n=7) degree of right-hemisphere dominance (LDRD and HDRD). EEG was recorded on neurovisor «NVX 36 digital DC EEG» in standard leads at rest and in successive imagination and fulfilment of movements by the right and left legs. Types of EEG were determined and the amplitude of the sensorimotor alpha-rhythm (mu-rhythm) was evaluated on the basis of analysis of spectral patterns of EEG. Results. It was shown that the majority of left-handed individuals with LDRD had type I EEG, and the minority had type III, whereas all left-handed individuals with HDRD had type I EEG. In imagination and realization of leg movements in the first group the quantity of individuals with EEG of type III increased, while in the second group the type of EEG did not change. Motor tasks were associated with depression of alpha-rhythm in central and frontal areas, but with different extent of evidence in lefties with LDRD and HDRD. More pronounced desynchronization of the central mu-rhythm was observed in left-handed individuals with HDRD, while the amplitude of the frontal alpha-rhythm, on the contrary, was more decreased in left-handed individuals with LDRD. Conclusions. The obtained data show dependence of EEG pattern in left-handed people during imagination and realization of motor acts by the leading and non-leading leg on the degree of the right hemisphere dominance that may find clinical application.

scholarly journals Acromial type in Brazilian young adults

2021 ◽  
Vol 20 (2) ◽  
pp. 327-332
Author(s):  
Jamille Santos de Almeida ◽  
Themis Moura Cardinot ◽  
Julio Cesar Rodrigues ◽  
Antônio Celso Faria Bueno ◽  
Liszt Palmeira de Oliveira ◽  
...  
Keyword(s):  
Young Adults ◽  
Left Shoulder ◽  
Type I ◽  
Type Ii ◽  
Shoulder Impingement ◽  
Type Iii ◽  
Left Handed ◽  
I 11 ◽  
And Gender ◽  
The Right

Introduction: Acromion curved and hooked play a key role in shoulder impingement syndrome. Little is known about the acromial type in Brazilian population. Aim: To describe the acromial type profile in Brazilian young adults; to evaluate its correlation to gender and handedness and the occurrence of symmetry between genders. Methodology: Forty acromions of 20 Brazilian adults, both genders, between 21-25 years old were studied. The acromion type was classified by Bigliani/Epstein method by supraspinatus outlet view radiographs. Results: As there was no gender difference in the occurrence of acromial type, we considered male and female groups together. Thus, of the 20 right acromions, we found 5 (25%) type I, 8 (40%) type II and 7 (35%) type III. Of the 20 left acromions, we found 4 (20%) type I, 11 (55%) type II and 5 (25%) type III. The only left-handed volunteer (100%) presented for the right and left shoulder acromial type III. Of the 19 right-handed volunteers, 5 (26.3%) presented right acromion type I, 8 (42.1%) type II, and 6 (31.6%) type III; for the left acromion, 4 (21.1%) presented type I, 11 (57.9%) type II, and 4 (21.1%) type III. Acromial symmetry occurred in female (60%) and male (70%) groups. Conclusion: Type II acromion was the most predominant for right and left shoulder in Brazilian young adults. There was no correlation between acromial type and gender. It was not possible to analyze the correlation between acromial type and handedness. Acromial type tends to be symmetric in our sample.

Neuropsychological and neuropsychiatric perspectives on maternal cradling preferences

2002 ◽  
Vol 11 (3) ◽  
pp. 170-176 ◽  
Author(s):  
Jechil S. Sieratzki ◽  
Bencie Woll
Keyword(s):  
Right Hemisphere ◽  
Special Role ◽  
Communication Behaviour ◽  
Social Attachment ◽  
Left Handed ◽  
New Findings ◽  
Hemisphere Dominance ◽  
The Right ◽  
Mother’S Voice

SUMMARYObjective – To assess competing explanations for the universal preference of mothers to cradle infants on their left side and to propose a relation to hemispheric asymmetry for social attachment and communication behaviour. Methods – A review of observational, experimental, physiological, psychological, neuro-physiological, and neuro-psychological studies, including new findings on the cradling behaviour of mothers with auditory or visual impairments. Results – A significant left-cradling bias is observed in both right- and left-handed mothers which cannot adequately be explained by arguments based on handedness or closer contact to the soothing sound of the maternal heartbeat. Observations of primate behaviour have led to the suggestion that the left-cradling bias may be related to a left visual field (right hemisphere) advantage for monitoring an infant's facial expressions of distress. However, more than just monitoring, cradling subserves the mother's connection with the infant. For that reason, we have suggested that left cradling might be related to a right hemisphere specialisation for emotional communication, i.e. the speech melody, smiles, signals, and stroking which mothers use to interact with their infants. Studies of mother-infant interaction show that the sound of the mother's voice is more soothing when cradling on the left, more stimulating when cradling on the right. Cradling laterality may thus be related to emotional state and behavioural intent. There is also evidence to suggest that left cradling is linked to a special role of the right hemisphere in social attachment behaviour. This function may be disturbed in mothers with postnatal depression who show abnormal right hemisphere activity. Conclusion – Cradling embodies the symbiotic relationship between mother and infant; various lines of evidence support the suggestion that the universal preference of mothers to cradle infants on their left side is related to a right hemisphere dominance for social attachment and communication behaviour.

scholarly journals Dichotic words listening test: technical aspects and results in normal right-handed individuals

1994 ◽  
Vol 52 (2) ◽  
pp. 204-209 ◽  
Author(s):  
Ana Regina Caner-Cukiert ◽  
Arthur Cukiert
Keyword(s):  
Cerebral Dominance ◽  
Listening Test ◽  
Left Handed ◽  
Listening Tests ◽  
Msec Interval ◽  
Normal Individuals ◽  
Hemisphere Dominance ◽  
Four Blocks ◽  
Right Ear Advantage ◽  
The Right

Dichotic listening tests have been being used in an increasing frequency to determine in a non-invasive way the cerebral dominance in right- and left-handed patients. This is especially relevant when surgery in eloquent brain areas is being contemplated. A Portuguese version of the dichotic words listening test was developed based mainly on Wexler's protocol. It consisted of 15 pairs of words with a stimulus dominance lower than 50%. They were recorded using natural voice and time and intensity synchronization by means of a specialized software. Each pair of words was presented twice in different channels within each block. The items were randomized and presented with a 300 msec interval between each trial. Four blocks of 30 pairs of words each were created, totalizing 120 trials. In the scoring process, the words heard over the right and left ears were wrote down. The number of times each word was heard over each ear was computed and their values subtracted yielding a partial score for each specific word pair. This process was repeated for all stimuli pair and a final score for right and left predominance was then reached. Thirty-two right handed normal individuals underwent the test 93.8% showed a right ear advantage. These results are very similar to the actual left hemisphere dominance rate in a right-handed population.

scholarly journals Sensory deficits in ipsilesional upper-extremity in chronic stroke patients

2015 ◽  
Vol 73 (10) ◽  
pp. 834-839 ◽  
Author(s):  
Núbia Maria Freire Vieira Lima ◽  
Karina Cândido Menegatti ◽  
Érica Yu ◽  
Natália Yumi Sacomoto ◽  
Thais Botossi Scalha ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Thermal Sensation ◽  
Chronic Stroke ◽  
Sensory Loss ◽  
Stroke Patients ◽  
Sensory Assessment ◽  
Sensory Deficits ◽  
Left Handed ◽  
Right Hemisphere Damage ◽  
The Right

Objective To investigate somatosensory deficits in the ipsilesional wrist and hand in chronic stroke patients and correlate these deficits with contralesional sensorimotor dysfunctions, functional testing, laterality and handedness.Methods Fifty subjects (twenty-two healthy volunteers and twenty-eight stroke patients) underwent evaluation with Semmes-Weinstein monofilaments, the sensory and motor Fugl-Meyer Assessment, the Nottingham Sensory Assessment in both wrists and hands and functional tests.Results Twenty-five patients had sensory changes in the wrist and hand contralateral to the stroke, and eighteen patients (64%) had sensory deficits in the ipsilesional wrist and hand. The most significant ipsilesional sensory loss was observed in the left-handed patients. We found that the patients with brain damage in the right hemisphere had better scores for ipsilesional tactile sensation.Conclusions A reduction in ipsilesional conscious proprioception, tactile or thermal sensation was found in stroke subjects. Right hemisphere damage and right-handed subjects had better scores in ipsilesional tactile sensation.

Aesthetic Preference and Lateral Dominance

1988 ◽  
Vol 67 (2) ◽  
pp. 555-561 ◽  
Author(s):  
Mary Ann Valentino ◽  
James W. Brown ◽  
W. A. Cronan-Hillix
Keyword(s):  
Right Hemisphere ◽  
Response Mode ◽  
Psychology Student ◽  
Manual Response ◽  
Verbal Responses ◽  
Left Handed ◽  
Manual Responses ◽  
Student Subjects ◽  
The Right ◽  
Aesthetic Preferences

Aesthetic preferences for photographs with the main focal content either to the left or right of the photograph's center were examined in right- and left-handed subjects. Verbal responses or manual responses were required. In one experiment with 261 introductory psychology student-subjects, left-handers more often preferred photographs with the more important part on the left (“left-geared”) than did right-handers. Exp. 2, involving 84 right-handed student subjects, showed that left-geared photographs presented on the left side were preferred more often than left-geared photographs presented on the right side, and left-geared photographs presented on the left side were more often chosen when a left-handed manual response was required. Interactions between handedness, position of the stimulus, language hemisphere, and response mode make it extremely difficult to ascertain whether the right hemisphere is really more involved in aesthetic decisions.

scholarly journals AUTOPSY FEATURES AT THE ACUTE DESTRUCTIVE PANCREATITIS

2020 ◽  
Vol 28 (2) ◽  
pp. 48-54
Author(s):  
Al'fiya K. Imayeva ◽  
Tagir I. Mustafin
Keyword(s):  
Acute Pancreatitis ◽  
Transverse Colon ◽  
Infectious Agent ◽  
Pathological Process ◽  
Postmortem Examination ◽  
Retroperitoneal Space ◽  
Contrast Study ◽  
Type I ◽  
Type Iii ◽  
The Right

In all variants of the destructive form of pancreatitis, the involvement of adipose tissue of both para-pancreatic and distant localization was noted. In this case, it is necessary to improve the pathological diagnosis of acute destructive pancreatitis. The aim of the study was to develop new techniques for postmortem examination of those who died from complications of acute pancreatitis. Pathological studies were supplemented by the methods proposed by the authors, which made it possible to clarify the spread of the infectious agent through the retroperitoneal tissue. The scheme proposed by the authors for recording changes in the tissue of the pancreas and surrounding tissues after a contrast study made it possible to clarify the main ways of propagation of the purulent-necrotic process along the retroperitoneal tissue. The results of postmortem examination of 67 deaths from complications of acute pancreatitis are presented. Based on the study, 5 types of acute destructive pancreatitis were identified. In type I, the pathological process involves the right half of the retroperitoneal tissue, including the mesentery root of the small intestine, the para-pancreatic region, the right para-kidney and sub-hepatic space. The second type is characterized by the presence of inflammatory and destructive changes in the fiber of the right lateral canal, the actual retroperitoneal space on the right and the mesentery root of the transverse colon. Purulent-necrotic changes in para-pancreatic, left perineal tissue, mesentery of the transverse colon, also in peritoneum were typical for type III acute destructive pancreatitis. For type IV disease, in addition to areas of involvement as in type III, involvement of the pelvic tissue and the left sections of the retroperitoneal space itself were noted. The spread of the infectious agent to both the right and left parts of the retroperitoneal tissue was defined as type V acute destructive pancreatitis.

scholarly journals Decreases in Frontal and Parietal Lobe Regional Cerebral Blood Flow Related to Habituation

1992 ◽  
Vol 12 (4) ◽  
pp. 546-553 ◽  
Author(s):  
Steven Warach ◽  
Ruben C. Gur ◽  
Raquel E. Gur ◽  
Brett E. Skolnick ◽  
Walter D. Obrist ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Parietal Lobe ◽  
Brain Activity ◽  
Inhalation Technique ◽  
Attentional Processes ◽  
Left Handed ◽  
Verbal Tasks ◽  
Spatial Tasks ◽  
Regional Specificity ◽  
The Right

We previously reported decreased mean CBF between consecutive resting conditions, ascribed to habituation. Here we address the regional specificity of habituation over three consecutive flow studies. Regional CBF (rCBF) was measured in 55 adults (12 right-handed men, 12 right-handed women, 14 left-handed men, 17 left-handed women), with the 133Xe inhalation technique, during three conditions: Resting, verbal tasks (analogies), and spatial tasks (line orientation). Changes in rCBF attributable to the cognitive tasks were eliminated by correcting these values to a resting equivalent. There was a progressive decrease in mean rCBF over time, reflecting habituation. This effect differed by region, with specificity at frontal (prefrontal, inferior frontal, midfrontal, superior frontal) and inferior parietal regions. In the inferior parietal region, habituation was more marked in the left than the right hemisphere. Right-handers showed greater habituation than did left-handers. There was no sex difference in global habituation, but males showed greater left whereas females showed greater right hemispheric habituation. The results suggest that habituation to the experimental setting has measurable effects on rCBF, which are differently lateralized for men and women. These effects are superimposed on task activation and are most pronounced in regions that have been implicated in attentional processes. Thus, regional decrement in brain activity related to habituation seems to complement attentional effects, suggesting a neural network for habituation reciprocating that for attention.

Dominance of the Right Hemisphere and Role of Area 2 in Human Kinesthesia

2005 ◽  
Vol 93 (2) ◽  
pp. 1020-1034 ◽  
Author(s):  
Eiichi Naito ◽  
Per E. Roland ◽  
Christian Grefkes ◽  
H. J. Choi ◽  
Simon Eickhoff ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Anterior Part ◽  
Premotor Cortex ◽  
Superior Temporal Gyrus ◽  
Lateral Part ◽  
Left Hand ◽  
Hemisphere Dominance ◽  
The Right ◽  
Processus Styloideus ◽  
Motor Areas

We have previously shown that motor areas are engaged when subjects experience illusory limb movements elicited by tendon vibration. However, traditionally cytoarchitectonic area 2 is held responsible for kinesthesia. Here we use functional magnetic resonance imaging and cytoarchitectural mapping to examine whether area 2 is engaged in kinesthesia, whether it is engaged bilaterally because area 2 in non-human primates has strong callosal connections, which other areas are active members of the network for kinesthesia, and if there is a dominance for the right hemisphere in kinesthesia as has been suggested. Ten right-handed blindfolded healthy subjects participated. The tendon of the extensor carpi ulnaris muscles of the right or left hand was vibrated at 80 Hz, which elicited illusory palmar flexion in an immobile hand (illusion). As control we applied identical stimuli to the skin over the processus styloideus ulnae, which did not elicit any illusions (vibration). We found robust activations in cortical motor areas [areas 4a, 4p, 6; dorsal premotor cortex (PMD) and bilateral supplementary motor area (SMA)] and ipsilateral cerebellum during kinesthetic illusions (illusion-vibration). The illusions also activated contralateral area 2 and right area 2 was active in common irrespective of illusions of right or left hand. Right areas 44, 45, anterior part of intraparietal region (IP1) and caudo-lateral part of parietal opercular region (OP1), cortex rostral to PMD, anterior insula and superior temporal gyrus were also activated in common during illusions of right or left hand. These right-sided areas were significantly more activated than the corresponding areas in the left hemisphere. The present data, together with our previous results, suggest that human kinesthesia is associated with a network of active brain areas that consists of motor areas, cerebellum, and the right fronto-parietal areas including high-order somatosensory areas. Furthermore, our results provide evidence for a right hemisphere dominance for perception of limb movement.

Sign in / Sign up

Export Citation Format

Share Document